. >>> big news in the world of education. federal officials say the high school graduation rate is going up. the nationwide average climbed to just above 78% in 2010, the last year with numbers available. there's a lot of work yet to be done. but it's the highest it's been since 1974. the main reason, they say, fewer jobs out there to tempt young people to leave high school. >>> still ahead as we continue on a tuesday evening, a major breakthrough regarding a big worry for a lot of parents, a lot of athletes, detecting the damage done by concussions and what could happen then later in life. >>> then later on, why beyonce's fans along with millions of inauguration viewers are saying, say it ain't so. >>> as we mentioned, there's news tonight on the subject of concussions which are finally getting a lot more attention of late among athletes and among parents. up till now, there's been no good way to figure out how much damage has been done after a concussion exactly. but ucla researchers working with some former nfl players may